Firearm Offenses

Milton Robert Petersen, 55, of Pavillion, Wyoming, was sentenced to 70 months' imprisonment with three years of supervised release for being a felon in possession of firearms. According to court documents, on March 13, 2025, officers executing a search warrant at Petersen's residence found him, along with two rifles, in a camper trailer on the property. Petersen, a multiple-time convicted felon, is prohibited from lawfully possessing firearms and admitted to the presence of numerous firearms on the premises. In total, law enforcement seized approximately 57 firearms during the search. The case was investigated by agents of the Wyoming Division of Criminal Investigation and the FBI Rocky Mountain Safe Trails Task Force. Assistant U.S. Attorney Timothy W. Gist prosecuted the case. Petersen was indicted on July 16, 2025, and pleaded guilty on Oct. 30, 2025. U.S. District Court Judge Alan B. Johnson imposed the sentence on Jan. 21 in Cheyenne. Case No. 25-CR-00109

Robert Dean Campbell, 50, of Cheyenne, Wyoming, was sentenced to 18 months in prison and two years of supervised release for being a felon in possession of a firearm. According to court documents, Campbell was sentenced in 2009 for possessing a firearm in furtherance of a drug trafficking crime. He violated his terms of supervised release in 2021 and absconded from supervision. On Aug. 15, 2024, the U.S. Marshals Service located Campbell at his girlfriend's camper in Cheyenne and arrested him on a warrant. Officers located a Ruger 9mm pistol in the camper, which he possessed. The Cheyenne Police Department and the U.S. Marshals Service investigated the crime. Assistant U.S. Attorney Paige Hammer prosecuted the case. Campbell was indicted on July 16, 2025, and pleaded guilty on Nov. 10, 2025. Chief U.S. District Judge Kelly H. Rankin imposed the sentence on Jan. 30 in Cheyenne.

Drug and Firearm Offenses

Jason Arnold Rohrich, 49, of Rapid City, South Dakota, was sentenced to 135 months' imprisonment with 3 years of supervised release for being a felon in possession of a firearm, to run concurrently with his sentence in Case No. 25-CR-00145 (below). According to court documents, on Sept. 11, 2024, the Wyoming Highway Patrol conducted a traffic stop on the defendant, who admitted his driver's license was suspended and that he had a large sum of cash in the center console. While securing the cash, a trooper discovered a baggie of methamphetamine on the floorboard. The Uinta County Sheriff's Office assisted with the search, during which deputies found additional baggies of methamphetamine hidden in secret compartments inside stainless steel cups, along with a semi-automatic pistol. Rohrich is a convicted felon and prohibited from possessing a firearm. Case No. 25-CR-00049

In a superseding indictment, Jason Arnold Rohrich, was also sentenced to180 months' imprisonment with 10 years of supervised release for possession with intent to distribute methamphetamine, to run concurrently to the above sentence. According to court documents in that case, on Oct. 3, 2024, the Idaho State Police conducted a traffic stop on I-15. Again, Rohrich admitted his driver's license was suspended and while he was trying to obtain other documents, the trooper noticed he was unable to control his body movements or sit still. After being arrested for suspicion of a DUI, Rohrich admitted he had a few thousand dollars' worth of methamphetamine in the vehicle. Bonneville County Sheriff's Office arrived on scene and deployed his K9. During the search of the car several pounds of methamphetamine were found in a box behind the driver's seat, several small baggies were found near the methamphetamine along with a .45 caliber Glock 21. Assistant U.S. Attorney Christyne M. Martens prosecuted the case. Rohrich was indicted in both cases on Jan. 28, 2025, and pleaded guilty on Oct. 21, 2025. U.S. District Court Judge Alan B. Johnson imposed the sentence on Jan. 23 in Cheyenne. Case No. Case No. 25-CR-00049 and 25-CR-00145

Tyler L. Riser, 32, of Riverton, Wyoming, was sentenced on three criminal offense counts to 41 months' imprisonment for distribution and conspiracy to distribute methamphetamine, and a consecutive 60 months for possession of firearms in furtherance of a drug trafficking crime. Five years of supervised release, per count, was also imposed to run concurrently. Following an investigation into drug trafficking on the Wind River Indian Reservation, Wyoming Division of Criminal Investigation (DCI) agents arrested Riser at his residence on February 25, 2025. A search warrant led to the seizure of seven firearms, ammunition, $2,334 in cash, approximately 21 grams of methamphetamine with packaging, and drug paraphernalia. Agents with the DCI and the FBI Rocky Mountain Safe Trails Task Force investigated the crime. Assistant U.S. Attorney Timothy W. Gist prosecuted the case. Riser was indicted on March 20, 2025, and pleaded guilty on May 16, 2025. U.S. District Court Judge Scott W. Skavdahl imposed the sentence on Jan. 28 in Casper. Case No. 25-CR-00053

Illegal Re-Entry of a Previously Deported Alien

Juan Pedro Rangel-Ventura, 25, of Jalisco, Mexico, was sentenced to time served plus 10 days to allow for deportation proceedings for illegal re-entry of a previously deported alien. According to court documents, on June 15, 2025, ICE located the defendant at the Sublette County Jail in Pinedale for a state offense. Based on the defendant's fingerprints, ICE determined he had previously been removed from the U.S. and had not applied for permission to reenter after being formally removed in November 2022. Assistant U.S. Attorney Cameron J. Cook prosecuted the case. Chief U.S. District Court Judge Kelly H. Rankin imposed the sentence on Jan. 20 in Cheyenne. Case No. 25-CR-00172

About the United States Attorney's Office

The United States Attorney's Office is responsible for representing the federal government in virtually all litigation involving the United States in the District of Wyoming, including all criminal prosecutions for violations of federal law, civil lawsuits brought by or against the government, and actions to collect judgments and restitution on behalf of victims and taxpayers. The Office is involved in several programs designed to make our communities safer. They include:

Project Safe ChildhoodLinks to other government and non-government sites will typically appear with the "external link" icon to indicate that you are leaving the Department of Justice website when you click the link.
Project Safe Childhood (PSC) is a DOJ initiative that combats the proliferation of technology-facilitated sexual exploitation crimes against children. The threat of sexual predators soliciting children for sexual contact is well-known and serious.

Operation Take Back America
Operation Take Back America is a nationwide initiative that marshals the full resources of the Department of Justice to repel the invasion of illegal immigration, achieve the total elimination of cartels and transnational criminal organizations (TCOs), and protect our communities from the perpetrators of violent crime. It also streamlines efforts and resources from the Department's Organized Crime Drug Enforcement Task Forces (OCDETFs) and Project Safe Neighborhood (PSN).

Victim Witness Program
The Victim Witness Coordinator for the United States Attorney's Office for the District of Wyoming is dedicated to ensuring victims of federal crimes and their family members are treated with compassion, fairness, and respect.